Steam-brake for locomotives



(No Model.) I

W. B. WALLACE. STEAM BRAKE FOR LOUOMOTIVE$.

Patented May 22,1883. I

ll """llllllln WITNESSES INVENTOR yb ATTORNEYS.

- UNITED STATES ATENT @FFICE."

WILL A B. wntnaon, OF BELLEV-ILLE, ILLINOIS.

STEAM-BRAKE FOR LOCOMOTIVES.

SPECIFICATION formingpart of Letters Patent No. 278,299, dated May 22, 1883. Application filed November 16, 1882. (No model.)

To all whom it may concern: H

Be it known that I, WILLIA BALFOUR WALLACE, a citizen of the United States, re-

' siding at Belleville, in the county of St. Clair and State of Illinois, have invented certain new and useful Im provementsin Steam-Brakes i for Locomotives, ofwhich the following is a a steam-cylinder, open at one end and closed at the opposite end, and provided with a piston, P, and a steam-port, a, near its closed end.

full, clear, and exact description, reference being had to the accompanying drawings and letters of reference marked thereon, in which Figure 1 is a top view of my improvedsteambrake as in astate of rest, with the upper plate, A, removed. Fig. 2 shows the same parts as in the actof operating thebrakerlever Z.- Fig. 3 is a perspective view of the Similar letters indicate like parts in all the figures. I My invention relates to improvements in steam-brakes forlocomotives; and it consists in the peculiar construction and arrangement of the parts, as hereinafter more fully set forth, and pointed out .in the claims.

In the accompanying drawings, C represents A A represent two parallel right-angular plates, of. the same dimensions, connected tos gether at their outer corners by the rollers c c, journaled in the plates-A A, which are open attheir inner ends to receive the cylinder 0.-

Between the plates A A, near their inner ends, and on opposite sides ofthe cylinder, are the opposite curved levers D D, having for Ztheir fulcra the pinsb b, journaledin the plates A. The curved. levers D Dare provided with rollers d d at their ends.

, -g 9 represent inclined planes, with their larger ends toward the open end of the cylinder 0, and their bases abutting or lying in contact with the sides of .the cylinder. E E represent arms lying on opposite sides of the cylinder, near its closed entl,in thesame right line at right cylinder.

The piston P projects beyond the open end of the cylinderQ'into the space between the angles to the axis of the plates A A, to which, it is secured. The cylinderG, with its pistonP, the plates A A,carrying the curved levers D D, the arms E E, and the inclined planes g are secured in any convenient manner below the floor of the en gineers cab. -One of the arms, E, is provided with a lug or projection, a, to which is secured one end of a chain, N, which passes thence partly around the rollers 01 of one of the levers D; thence around the rollers e c, and partly around the rollers of the opposite lever D; thence partly around theroller a on the opposite a-rmE, the opposite end of thechain being pivotally secured to one end of the rod 0, the opposite end of said rod 0 being pivotally connected with the brake-lever Z, fulcrnmed at h and carrying a brake bar or shoe at its lower end.

. It will be seen in this construction that the inner rollers of the lovers bear on the inclined planes 9 at their inner or smaller ends, and that the chain N is straight on the opposite sides-ofthe loop formed in it.

Y represents a closed cylindrical steam-receptacle securely fastened in some convenient place, preferably above the engineers head,

and provided at its upper end with a pipe, K,

leading to the steam-space of the boiler of the locomotive.

r is a port in the lower part of the steamreceptacle Y, and It is a pipe connectingthe port 1" in the steam-receptacle with the port 00 in the inner end of the. cylinder 0, whereby steam is admitted into the latter to drive the. piston P. L V s pp and e are ports in the steam-receptacle Y, the former ports, 19 p, leading into the eX- V being rocked to and fro in the steam-receptacle Y by oscillating the leverL at right angles to its arm S. The valve V is provided with the ports p 11, adapted in one position of said -Y.' The quadrant q is provided with the recesses o 0 o to receive and hold the lever L and valve V when oscillated. When the lever is in the recess 0 the piston 1? is in the position shown in Fig. 1, all the ports are closed,

the brake is not applied, the opposite sides of the loop in the chain are straight, and the parts are in their normal condition.

If it is desired to apply the brake, the lever L is oscillated and made to engage with the recess 0, which brings the valve into the position shown in Fig. 10, and opening the port r, whence the steam escapes through the pipe B into the cylinder through its port a and forces the piston outward, and with it the plates A A, to which the lower end of the piston is secured. In the outward movement of the plates A A the inner rolls,.d d, of the levers D D, riding on the inclined planes, will assume the position shown in Fig. 2, and the opposite sides of the loop in the chain will assume a bent or zigzag form and move the brake-lever arm Z more than twice as far as the piston is moved, or the brake-lever arm Z will be Inoved as much farther as the difference between a straight line-and the length of these zigzags- 0r bends in the chain.

If it is desired to stop the action of the brake, the lever Lis moved to the recess 0 of the quadrant q, as shown in Fig. 9. This movement brings the recess r in the back face of the valve V over the port r of the pipe R and 6, andthence to the pipe a, and thence to the pipe m, leaving no steam in the cylinder 0 and a partial vacuum in its steam-space, when the outward pressure of the air will force the piston back into the cylinder, and with it the frame A A, leaving the opposite sides of the loop in the chain straight.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with the'arms E E and the cylinder 0, provided with the piston I, of the platesA A, secured to the piston and havingguiderollers c 0, chain N, and brake-lever Z, substantially as described.

2. The combination, with theinclined planes 9, arms E E,and cylinder 0, provided with the .piston P, of the plates A A, secured to the piston, and provided with the guide-rollers c and levers D, having rolls d at their ends, chain N, and brake-lever Z, substantially as described.

3. The combination, with the plates A A, secured to the piston and provided with the guide-rollers c and levers D,armsEE,inclined planes 9, chain N, and brake-lever Z, of the cylinder 0, provided with the piston P and port or, steam-pipe R, and steam-receptacle Y, substantially as described.

4. The combination,with the cylinder 0, provided with the piston P andsteam-port 00, of

the pipe R, steam-receptacle Y, having port 1*,and rocking valve V, substantially as described.

5. The combination,with the cylinder 0, provided with the piston P and port so, of the pipe It, steam-receptacle Y, provided with the pipe K, ports 4* p p e, exhaust-pipe m, pipe at, and

rocking valve V, provided with the ports pp.

and recess 1', substantially as described.

6. The combination, with the steam-receptacle Y, provided with the pipes KR m a and ports 19 p or, of the rocking valve V, provided with the ports pp, recess 4", and studs T T,

lever L, having arm S,and quadrant q, having recesses 0 o 0, substantially as described.

Witnesses:

JOSEPH TROLL, F. BECHTOLD. 

